Is it gas pain or round ligament?

An

Can someone describe their gas pain? I am currently 12w3d and have had obvious gas pain throughout my pregnancy but this feels different. It’s only on my right side. Starts on right pelvis area and goes up into my stomach. I feel like I’m passing gas. I’m thinking it’s also the babies starting to push my organs out of the way. I have IBS so I am super sensitive.